1992/0222/port/taslock.c (diff list | history)

1992/0222/sys/src/9/port/taslock.c:1,52 – 1992/0321/sys/src/9/port/taslock.c:1,52 (short | long | prev | next)
Move lib.h to ../port. rsc Fri Mar 4 12:44:25 2005
1992/0222		#include "u.h" #include "lib.h"
1992/0321		#include "../port/lib.h"
1992/0222		#include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" void lock(Lock *l) { Lock *ll = l; int i; ulong pc; pc = getcallerpc(((uchar*)&l) - sizeof(l)); for(i = 0; i < 1000000; i++){ if (tas(&ll->key) == 0){ if(u) u->p->hasspin = 1; ll->pc = pc; return; } if(u && u->p->state == Running) sched(); } i = l->key; l->key = 0; panic("lock loop 0x%lux key 0x%lux pc 0x%lux held by pc 0x%lux\n", l, i, pc, l->pc); } int canlock(Lock *l) { if(tas(&l->key)) return 0; l->pc = getcallerpc(((uchar*)&l) - sizeof(l)); if(u && u->p) u->p->hasspin = 1; return 1; } void unlock(Lock *l) { l->pc = 0; l->key = 0; if(u && u->p) u->p->hasspin = 0; }